Jepson eFlora
Key to families | Table of families and genera

Key to Mammillaria

View taxon page for Mammillaria

1. Radial spines in 2–3 superimposed ranks; outer perianth parts long-fringed, inner perianth parts 20–28; seed with large corky aril ..... M. tetrancistra

1' Radial spines in 1 rank; outer perianth parts entire or short-fringed, inner perianth parts 8–16; seed aril 0

2. Inner perianth parts cream to white; bristles in axils of tubercles ..... M. dioica

2' Inner perianth parts rose-pink to rose-purple; axillary bristles 0 ..... M. grahamii var. grahamii

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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